public class Demo1 {
    public static void main(String[] args) {
        int count = 0;
        for(int i = 1;i <= 100;i ++) {
            if(i/10==9) {
                count++;
            }else if(i%10==9) {
                count++;
            }
        }
        System.out.println(count);
    }
}

